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Fair Value Measurements - Schedule of Fair value on Recurring Basic (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Current portion of contingent consideration $ 272 $ 236
Contingent consideration, net of current portion 231 263
Significant Unobservable Inputs (Level 3) [Member]      
Total contingent consideration liability 503 499  
Fair Value, Measurements, Recurring [Member]      
Current portion of contingent consideration   236  
Contingent consideration, net of current portion   263  
Total contingent consideration liability 503 499  
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]      
Current portion of contingent consideration    
Contingent consideration, net of current portion    
Total contingent consideration liability  
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]      
Current portion of contingent consideration    
Contingent consideration, net of current portion    
Total contingent consideration liability  
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]      
Current portion of contingent consideration   236  
Contingent consideration, net of current portion   263  
Total contingent consideration liability $ 503 $ 499